用超快脉冲实现囚禁镉离子的高效光电离负载
Efficient Photoionization-Loading of Trapped Cadmium Ions with Ultrafast Pulses
摘要：
利用超快激光脉冲使镉蒸气中的原子光电离，将镉原子离子装入射频离子阱。的光致电离是通过一个中间的原子共振驱动的频率四倍锁模钛：蓝宝石激光器，产生脉冲的100飞秒或1皮秒的持续时间在229 nm的中心波长。的大带宽的脉冲光电离的所有速度类的镉蒸气，导致在高负载效率相比，以前的离子阱加载技术。测得的加载速率进行比较，一个简单的理论模型，我们得出结论，这种技术可以潜在地使每个原子穿过激光束内的捕获量。这可以允许离子阱以较低水平的背景压力和较少的阱电极表面污染进行操作。本文所介绍的技术和激光系统适用于大多数激光冷却离子的加载。
英文摘要：
Atomic cadmium ions are loaded into radiofrequency ion traps by photoionization of atoms in a cadmium vapor with ultrafast laser pulses. The photoionization is driven through an intermediate atomic resonance with a frequency-quadrupled mode-locked Ti:Sapphire laser that produces pulses of either 100 fsec or 1 psec duration at a central wavelength of 229 nm. The large bandwidth of the pulses photoionizes all velocity classes of the Cd vapor, resulting in high loading efficiencies compared to previous ion trap loading techniques. Measured loading rates are compared with a simple theoretical model, and we conclude that this technique can potentially ionize every atom traversing the laser beam within the trapping volume. This may allow the operation of ion traps with lower levels of background pressures and less trap electrode surface contamination. The technique and laser system reported here should be applicable to loading most laser-cooled ion species.
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